Heavy truck intake flat pipe
By designing a system that includes air filter, turbocharger and intake flat tube, the combination of air guide flexure, air guide assembly and air outlet bend tube is used to solve the shortcomings of the existing heavy truck intake system in air flow stability and pressure loss, achieving efficient air flow and self-cleaning, and enhancing the performance and durability of heavy trucks.
Patent Information
- Application Number
- CN202411945261.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2044-12-27
AI Technical Summary
When existing heavy truck intake systems face strict environmental regulations and power response requirements, it is difficult to minimize airflow stability and pressure losses, while facing challenges of strength, durability and maintenance convenience in harsh environments.
A system including an air filter, a turbocharger and a flat intake pipe is designed. Through the combination of air guide bends, air guide components and air outlet bends, the bellows fittings and Tesla valve structures are used to achieve efficient flow and self-cleaning of air, and combined with the pressure measuring device and the pressure relief valve port to adjust the internal pressure.
It improves the air flow quality, reduces turbulence and noise, enhances the performance of heavy trucks, extends the durability of the device, and improves the self-cleaning capacity, ensuring stable operation in harsh environments.
Smart Images

Figure CN119373630B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of automobile manufacturing, in particular to a heavy truck air intake flat pipe. Background Art
[0002] Heavy trucks (HTCs) play a vital role in the modern transportation industry. In order to improve transportation efficiency and reduce operating costs, the optimization of the engine design and intake system of HTCs has become increasingly important. As a key component of the intake system of HTCs, the intake flat pipe is responsible for guiding external air to the engine to support the combustion process and improve the power and efficiency of the engine.
[0003] Good intake performance directly affects the power output and fuel economy of heavy trucks. In order to meet increasingly stringent environmental regulations and improve power response, the design of heavy truck intake systems must consider the smoothness of airflow and the minimization of pressure loss. The structure, length, inner diameter and material selection of the intake flat pipe will directly affect the characteristics of air flow. Therefore, optimizing the design of the intake flat pipe can effectively reduce turbulence and noise, improve air flow quality, and thus enhance the performance of heavy trucks under various working conditions.
[0004] In addition, the operating environment of heavy trucks is usually harsh, and the intake flat pipe needs to withstand multiple challenges such as high temperature, high pressure and vibration. Therefore, when designing the intake flat pipe, its strength, durability and maintenance convenience need to be comprehensively considered to ensure its stability and safety in long-term use.
[0005] In summary, the air intake flat pipe plays a key role in the overall performance and environmental protection of heavy trucks. In order to meet the challenges and development needs of the modern transportation industry, the heavy truck air intake flat pipe is introduced. Summary of the invention
[0006] The purpose of the present invention is to provide a heavy truck air intake flat pipe to solve the problems raised in the above background technology.
[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:
[0008] The heavy-duty truck intake flat pipe comprises an air filter, a turbocharger and an intake flat pipe, one end of the intake flat pipe is connected to the turbocharger for air supply, the other end of the intake flat pipe is provided with an air guide elbow, one end of the air guide elbow is connected to an air guide component, the air guide component guides air to flow to an outlet elbow connected to the end, and the outlet elbow transmits air to the air filter for filtration;
[0009] The air guide assembly includes a tube body, the outer wall of the tube body is provided with a corrugated ring, one side of the tube body is connected with a ferrule, the tube body is connected to the air guide elbow through the ferrule, the inner wall of the corrugated ring is provided with a scraper, and the inner wall of the corrugated ring is provided with a filter plate parallel to the scraper;
[0010] A pressure relief valve port is installed on one side of the air guide elbow, and a pressure measuring device is provided on one side of the air outlet elbow, and the pressure measuring device cooperates with the pressure relief valve port to control the internal pressure of the air intake flat pipe;
[0011] The cross section of the air intake flat tube is set to be trapezoidal, and the two ends of the air intake flat tube are respectively set to be wide and narrow, and the end of the wide opening of the air intake flat tube is connected to the turbocharger. The external air is sucked in through the turbocharger, and the air flows along the inner wall of the air intake flat tube. When flowing on the inner wall of the air intake flat tube, the air flows in from the wide opening and then flows to the narrow opening, changing the size of the air flow aperture, increasing the air pressure, accelerating the flow speed of the air in the air intake flat tube, improving the air supply efficiency of the air intake flat tube for subsequent engine operation, and ensuring the stable output of the engine power.
[0012] The air guide bend and the outlet bend are both configured as arc-shaped pipes. The air guide assembly is formed of a retractable bellows fitting through a tube body and a corrugated ring. The tube body and the corrugated ring are both made of elastic and smooth rubber and plastic materials. The bellows fitting formed by the tube body and the corrugated ring is convenient for the user to twist the relative position between the outlet bend and the inlet flat tube, and is convenient for the user to install the device. The gas in the inlet flat tube is transmitted through the bellows fitting. After the gas is squeezed by the inlet flat tube, the air flows to the inner wall of the air guide assembly. The air squeezes the tube body and the corrugated ring. The corrugated ring expands outward relative to the tube body, buffering the pressure of the gas, reducing the reaction force of the high pressure generated by the compressed gas on the internal device, and extending the overall durability of the device.
[0013] The scraper and the filter plate are both arranged in an annular shape, and the scraper and the filter plate are arranged symmetrically about the horizontal midline of the corrugated ring. A scraping clamp is arranged on one side of the scraper close to the filter plate, and a dust filter clamp is arranged on one side of the filter plate close to the scraper, and the inner wall of the dust filter clamp is in conflict with the outer wall of the scraping clamp. During the flow of air inside the air guide component, the air quickly flows through the tube body and the corrugated ring, and a hollow chamber is formed by the corrugated ring, the scraper and the filter plate. The fast-flowing air exerts a negative pressure effect on the inside of the hollow chamber, so that part of the air is sucked into the hollow chamber and filtered through the filter plate. At the same time, when the high-pressure air flows, the air pressure squeezes the corrugated ring to expand, so that the corrugated ring drives the scrapers and the filter plates arranged symmetrically on both sides to rub against each other. The scraper scrapes and cleans the dust filter clamp in the filter plate through the scraping clamp, and the filtered dust is self-cleaned, thereby improving the self-cleaning ability of the device, reducing the sticky accumulation of dust on the inner wall of the device, and ensuring smooth air circulation.
[0014] A through hole is vertically opened on one side of the scraper away from the filter plate, and the scraper is connected to the inner wall of the corrugated ring through the through hole. The corrugated ring forms a Tesla valve structure through the scraper and the filter plate. In the air guide assembly, air flows from the direction of the filter plate to the direction of the scraper, and the air is filtered through the filter plate and enters the hollow chamber on the inner wall of the corrugated ring, and then flows out through the through hole in the scraper on the other side of the corrugated ring, pushing the air to flow along the inner wall of the air guide assembly, avoiding the influence of air pressure on the conflict between the scraper and the filter plate, and achieving the effect of a check valve through the Tesla valve structure formed by the corrugated ring, the scraper and the filter plate, avoiding air backflow, guiding the direction of air flow, avoiding the formation of turbulence in the air guide assembly, and reducing the overall noise of the device.
[0015] An electric valve is arranged inside the pressure relief valve port, and the pressure measuring device includes a pressure gauge. The electric valve and the pressure gauge are electrically connected, and the pressure gauge is used to control the opening and closing of the electric valve. The pressure value inside the outlet elbow is monitored by the pressure measuring device to control the opening and closing of the pressure relief valve port. When the pressure gauge detects that the pressure inside the device is too high, the electric valve is controlled to open the pressure relief valve port, and the excess gas in the air intake flat tube is discharged through the pressure relief valve port to reduce the overall pressure inside the device. When the pressure gauge detects that the pressure inside the device is too low, it means that one end of the air intake flat tube is blocked and the internal gas cannot be supplied in time. The electric valve is controlled to fully open the pressure relief valve port, and the pressure relief valve port is used to increase the air intake volume, so as to alleviate the problem of insufficient air supply and avoid damage to the device by long-term high-pressure and low-pressure environments.
[0016] The two ferrules are symmetrically arranged at both ends of the tube body, and the two ferrules are respectively threadedly connected to one end of the air guide elbow and one end of the air outlet elbow. The air guide assembly forms a detachable structure through the ferrule, the air guide elbow and the air outlet elbow.
[0017] Compared with the prior art, the beneficial effects achieved by the present invention are:
[0018] The present invention provides an air inlet flat tube, an air guide bent tube, an air guide assembly and an air outlet bent tube, and utilizes a corrugated tube fitting composed of a tube body corrugated ring, so that the user can twist the relative position between the air outlet bent tube and the air inlet flat tube, thereby facilitating the installation of the device by the user. The gas in the air inlet flat tube is transmitted by the corrugated tube fitting, and the pressure of the gas is buffered, thereby reducing the reaction force of the high pressure generated by the compressed gas on the internal device, and extending the overall durability of the device. At the same time, the scraper and filter plate symmetrically arranged on both sides are driven by the corrugated ring to rub against each other, and the scraper scrapes and cleans the filter plate, thereby improving the self-cleaning ability of the device, reducing the sticky accumulation of dust on the inner wall of the device, and ensuring smooth air circulation. The Tesla valve structure composed of the corrugated ring, the scraper and the filter plate achieves the effect of a check valve, guides the air flow direction, avoids the formation of turbulence in the air guide assembly, and reduces the overall noise of the device. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:
[0020] Figure 1 It is a schematic diagram of the structure of the present invention;
[0021] Figure 2 It is a schematic diagram of a top cross-sectional structure of the present invention;
[0022] Figure 3 It is a schematic diagram of the structure of the gas guide assembly of the present invention;
[0023] Figure 4 is a schematic diagram of the cross-sectional structure of the air guide assembly of the present invention;
[0024] Figure 5 The present invention Figure 4 Enlarged structural diagram at A in the middle.
[0025] In the figure:
[0026] 1. Intake flat pipe;
[0027] 2. Air guide elbow;
[0028] 3. Air guide assembly; 301. Tube body; 302. Corrugated ring; 303. Card sleeve; 304. Scraper; 305. Filter plate;
[0029] 4. Air outlet elbow;
[0030] 5. Pressure relief valve port;
[0031] 6. Pressure measuring device. DETAILED DESCRIPTION
[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0033] See also Figure 1-Figure 5 , the present invention provides a technical solution:
[0034] The heavy-duty truck air intake flat pipe comprises an air filter, a turbocharger and an air intake flat pipe 1. One end of the air intake flat pipe 1 is connected to the turbocharger for air supply. The other end of the air intake flat pipe 1 is provided with an air guide elbow 2. One end of the air guide elbow 2 is connected to an air guide component 3. The air guide component 3 guides air to flow to an air outlet elbow 4 connected to the end. The air outlet elbow 4 transmits air to the air filter for filtration.
[0035] The air guide component 3 includes a tube body 301, the outer wall of the tube body 301 is provided with a corrugated ring 302, one side of the tube body 301 is connected with a ferrule 303, the tube body 301 is connected to the air guide elbow 2 through the ferrule 303, the inner wall of the corrugated ring 302 is provided with a scraper 304, and the inner wall of the corrugated ring 302 is provided with a filter plate 305 parallel to the scraper 304;
[0036] A pressure relief valve port 5 is installed on one side of the air guide elbow 2, and a pressure measuring device 6 is provided on one side of the air outlet elbow 4. The pressure measuring device 6 cooperates with the pressure relief valve port 5 to control the internal pressure of the air intake flat pipe 1;
[0037] The cross section of the air intake flat pipe 1 is set to be trapezoidal, and the two ends of the air intake flat pipe 1 are respectively set to be wide and narrow, and the wide end of the air intake flat pipe 1 is connected to the turbocharger.
[0038] In one embodiment, external air is sucked in through a turbocharger, and the air flows along the inner wall of the intake flat pipe 1. When flowing along the inner wall of the intake flat pipe 1, the air flows in from the wide opening and then flows to the narrow opening, thereby changing the size of the air flow aperture, increasing the air pressure, accelerating the flow speed of the air in the intake flat pipe 1, and improving the air supply efficiency of the intake flat pipe 1 for subsequent engine operation, thereby ensuring the stable output of the engine power.
[0039] The air guide elbow 2 and the air outlet elbow 4 are both configured as arc-shaped pipes. The air guide component 3 forms a retractable corrugated pipe through the pipe body 301 and the corrugated ring 302. The pipe body 301 and the corrugated ring 302 are both made of elastic and smooth rubber and plastic materials.
[0040] The scraper 304 and the filter plate 305 are both arranged in a ring shape, and are symmetrically arranged about the horizontal midline of the corrugated ring 302. A scraper clamp is arranged on the side of the scraper 304 close to the filter plate 305, and a dust filter clamp is arranged on the side of the filter plate 305 close to the scraper 304, and the inner wall of the dust filter clamp is in conflict with the outer wall of the scraper clamp.
[0041] In one embodiment, when air flows inside the air guide component 3, the air quickly flows through the tube body 301 and the corrugated ring 302, and a hollow chamber is formed by the corrugated ring 302, the scraper 304 and the filter plate 305. The quickly flowing air produces a negative pressure effect on the inside of the hollow chamber, so that part of the air is sucked into the hollow chamber and filtered by the filter plate 305. At the same time, when high-pressure air flows, the air pressure squeezes the corrugated ring 302 to expand, so that the corrugated ring 302 drives the scrapers 304 and the filter plates 305 symmetrically arranged on both sides to rub against each other. The scraper 304 scrapes and cleans the dust filter ring in the filter plate 305 through the scraping ring, and self-cleans the filtered dust, thereby improving the self-cleaning ability of the device, reducing the sticky accumulation of dust on the inner wall of the device, and ensuring smooth air circulation.
[0042] A through hole is vertically opened on one side of the scraper 304 away from the filter plate 305 , and the scraper 304 is connected to the inner wall of the corrugated ring 302 through the through hole. The corrugated ring 302 forms a Tesla valve structure through the scraper 304 and the filter plate 305 .
[0043] In one embodiment, in the air guide component 3, air flows from the direction of the filter plate 305 to the direction of the scraper plate 304. The air is filtered through the filter plate 305 and enters the hollow chamber on the inner wall of the corrugated ring 302. Then, the air flows out through the through hole in the scraper plate 304 on the other side of the corrugated ring 302, pushing the air to flow along the inner wall of the air guide component 3 to avoid the air pressure from affecting the conflict between the scraper plate 304 and the filter plate 305. The Tesla valve structure formed by the corrugated ring 302, the scraper plate 304 and the filter plate 305 achieves the effect of a check valve, avoids air backflow, guides the air flow direction, avoids the formation of turbulence in the air guide component 3, and reduces the overall noise of the device.
[0044] Two ferrules 303 are symmetrically arranged at both ends of the tube body 301. The two ferrules 303 are threadedly connected to one end of the air guide elbow 2 and one end of the air outlet elbow 4 respectively. The air guide component 3 forms a detachable structure through the ferrule 303, the air guide elbow 2 and the air outlet elbow 4.
[0045] In one embodiment, the bellows fitting formed by the tube body 301 and the bellows ring 302 is convenient for the user to twist the relative position between the air outlet elbow 4 and the air inlet flat tube 1, so as to facilitate the installation of the device by the user. The gas in the air inlet flat tube 1 is transmitted by the bellows fitting. After the gas is squeezed by the air inlet flat tube 1, the air flows to the inner wall of the air guide component 3. The air squeezes the tube body 301 and the bellows ring 302. The bellows ring 302 expands outward relative to the tube body 301, buffering the pressure of the gas, reducing the reaction force of the high pressure generated by the compressed gas on the internal device, and extending the overall durability of the device.
[0046] An electric valve is arranged inside the pressure relief valve port 5, and the pressure measuring device 6 includes a pressure measuring instrument. The electric valve and the pressure measuring instrument are electrically connected, and the pressure measuring instrument is used to control the switch of the electric valve.
[0047] In one embodiment, the pressure value inside the air outlet elbow 4 is monitored by a pressure measuring device 6 to control the switch of the pressure relief valve port 5. When the pressure gauge detects that the pressure inside the device is too high, the electric valve is controlled to open the pressure relief valve port 5, and the excess gas in the air intake flat tube 1 is discharged through the pressure relief valve port 5 to reduce the overall pressure inside the device. When the pressure gauge detects that the pressure inside the device is too low, it means that one end of the air intake flat tube 1 is blocked and the internal gas cannot be supplied in time. The electric valve is controlled to fully open the pressure relief valve port 5, and the pressure relief valve port 5 is used to increase the air intake volume, thereby alleviating the problem of insufficient air supply and avoiding damage to the device by long-term high-pressure and low-pressure environments.
[0048] Working principle of the present invention:
[0049] First, by connecting the first section of the air intake flat pipe 1 to the turbocharger and the end of the air outlet elbow 4 to the air filter, the user twists the relative position between the air outlet elbow 4 and the air intake flat pipe 1 to facilitate the user to install the device;
[0050] The turbocharger inhales external air, and the air flows along the inner wall of the intake flat pipe 1. When flowing along the inner wall of the intake flat pipe 1, the air flows in from the wide opening and then flows to the narrow opening, changing the size of the air flow aperture, increasing the air pressure, speeding up the flow speed of the air in the intake flat pipe 1, and improving the air supply efficiency of the intake flat pipe 1 for subsequent engine operation, thereby ensuring the stable output of the engine power;
[0051] The gas in the intake flat tube 1 is transmitted through the bellows. After being squeezed by the intake flat tube 1, the air flows to the inner wall of the air guide component 3. The air squeezes the tube body 301 and the bellows ring 302. The bellows ring 302 expands outward relative to the tube body 301, buffering the pressure of the gas and reducing the reaction force of the high pressure generated by the compressed gas on the internal device.
[0052] During the process of air flowing inside the air guide component 3, the air quickly flows through the tube body 301 and the corrugated ring 302, and a hollow chamber is formed by the corrugated ring 302, the scraper 304 and the filter plate 305. The quickly flowing air produces a negative pressure effect on the inside of the hollow chamber, so that part of the air is sucked into the hollow chamber and filtered by the filter plate 305. At the same time, when the high-pressure air flows, the air pressure squeezes the corrugated ring 302 to expand, so that the corrugated ring 302 drives the scrapers 304 and the filter plate 305 symmetrically arranged on both sides to rub against each other. The scraper 304 scrapes and cleans the dust filter ring in the filter plate 305 through the scraping clamp ring, and the filtered dust is self-cleaned, thereby improving the self-cleaning ability of the device and reducing the adhesion and accumulation of dust on the inner wall of the device;
[0053] In the air guide component 3, the air flows from the direction of the filter plate 305 to the direction of the scraper plate 304. The air is filtered through the filter plate 305 and enters the hollow chamber on the inner wall of the corrugated ring 302. Then, the air flows out through the through hole in the scraper plate 304 on the other side of the corrugated ring 302, pushing the air to flow along the inner wall of the air guide component 3, avoiding the air pressure from affecting the conflict between the scraper plate 304 and the filter plate 305. The Tesla valve structure composed of the corrugated ring 302, the scraper plate 304 and the filter plate 305 achieves the effect of a check valve, avoiding air backflow, guiding the air flow direction, avoiding the air from forming turbulence in the air guide component 3, and reducing the overall noise of the device.
[0054] At the same time, the pressure value inside the air outlet elbow 4 is monitored by the pressure measuring device 6 to control the switch of the pressure relief valve port 5. When the pressure gauge detects that the pressure inside the device is too high, the electric valve is controlled to open the pressure relief valve port 5, and the excess gas in the air intake flat tube 1 is discharged through the pressure relief valve port 5 to reduce the overall pressure inside the device. When the pressure gauge detects that the pressure inside the device is too low, it means that one end of the air intake flat tube 1 is blocked and the internal gas cannot be supplied in time, the electric valve is controlled to fully open the pressure relief valve port 5, and the pressure relief valve port 5 is used to increase the air intake to alleviate the problem of insufficient air supply.
[0055] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0056] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A heavy-duty truck air intake flat pipe, comprising an air filter, a turbocharger and an air intake flat pipe (1), characterized in that: One end of the air intake flat pipe (1) is connected to a turbocharger for air supply, the other end of the air intake flat pipe (1) is provided with an air guide elbow (2), one end of the air guide elbow (2) is connected to an air guide component (3), the air guide component (3) guides air to flow to an air outlet elbow (4) connected to the end, and the air outlet elbow (4) transmits air to an air filter for filtration; The air guide component (3) comprises a tube body (301), the outer wall of the tube body (301) is provided with a corrugated ring (302), one side of the tube body (301) is connected with a ferrule (303), the tube body (301) is connected to the air guide elbow (2) via the ferrule (303), the inner wall of the corrugated ring (302) is provided with a scraper (304), and the inner wall of the corrugated ring (302) is provided with a filter plate (305) parallel to the scraper (304); A pressure relief valve port (5) is installed on one side of the air guide bend (2), and a pressure measuring device (6) is provided on one side of the air outlet bend (4). The pressure measuring device (6) cooperates with the pressure relief valve port (5) to control the internal pressure of the air intake flat tube (1); The scraper (304) and the filter plate (305) are both arranged in an annular shape, and the scraper (304) and the filter plate (305) are arranged symmetrically about the horizontal midline of the corrugated ring (302); a scraper clamp ring is arranged on one side of the scraper (304) close to the filter plate (305); a dust filter clamp ring is arranged on one side of the filter plate (305) close to the scraper (304); and the inner wall of the dust filter clamp ring abuts against the outer wall of the scraper clamp ring; A through hole is vertically opened on one side of the scraper (304) away from the filter plate (305); the scraper (304) is connected to the inner wall of the corrugated ring (302) through the through hole; the corrugated ring (302) forms a Tesla valve structure through the scraper (304) and the filter plate (305).
2. The heavy truck air intake flat pipe according to claim 1, characterized in that: The cross section of the air intake flat pipe (1) is arranged to be a trapezoid, and the two ends of the air intake flat pipe (1) are arranged to be a wide opening and a narrow opening respectively, and the wide opening end of the air intake flat pipe (1) is connected to the turbocharger.
3. The heavy truck air intake flat pipe according to claim 2, characterized in that: The air guide elbow (2) and the air outlet elbow (4) are both configured as arc-shaped pipes, and the air guide component (3) forms a retractable corrugated pipe component through a pipe body (301) and a corrugated ring (302), and the pipe body (301) and the corrugated ring (302) are both made of elastic and smooth rubber and plastic material.
4. The heavy truck air intake flat pipe according to claim 1, characterized in that: An electric valve is arranged inside the pressure relief valve port (5), and the pressure measuring device (6) comprises a pressure measuring instrument. The electric valve and the pressure measuring instrument are electrically connected, and the pressure measuring instrument is used to control the opening and closing of the electric valve.
5. The heavy truck air intake flat pipe according to claim 1, characterized in that: Two of the ferrules (303) are symmetrically arranged at both ends of the tube body (301); the two ferrules (303) are respectively threadedly connected to one end of the air guide elbow (2) and one end of the air outlet elbow (4); the air guide assembly (3) forms a detachable structure through the ferrules (303), the air guide elbow (2) and the air outlet elbow (4).
Citation Information
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Split type liquid cooling super fast charging equipment
CN118269720A
Air inlet device of automobile air filter
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